Question

A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be a/an

• A. intrinsic semiconductor
• B. p-type semiconductor
• C. n-type semiconductor
• D. p-n junction diode

Answer 1

The correct option is D p-n junction diode

A p-n junction is a device in which current flows through the junction when it is forward biased whereas when reverse biased, it conducts a very small current (almost zero) untill the output voltage equals the breakdown voltage.

Moreover, current through the intrinsic as well as extrinsic semiconductor does not depend on the polarity of the battery.